1. Chirurgische Universitätsklinik der Universität Freiburg, Freiburg,1
2. Institut für Biochemie-Genzentrum-der LMU München, Munich,2 and
3. Chiron Behring GmbH, Marburg,3 Germany, and
4. Department of Microbiology and Immunology, School of Medicine, Louisiana State University Medical Center, Shreveport, Louisiana4